From: Tom Young (gitsyoung@xxxxxxxxxxx)
Date: Mon Jul 15 2002 - 02:53:33 GMT-3
Fred,
Oh my God, thank you for so percious information you
provided me. It is very helpful.
Good luck
--- Fred Ingham <fingham@cox.net> $B$+$i$N%a%C%;!<%8!'(B
> Tom: Knowing which SAPs are used by SNA will offer
> no insight
> into the functions that SNA higher levels are
> performing. For that you will
> need to study SNA and become imersed in PU's, LU's
> and more. SNA uses LLC
> Type 2 for exchanges with the exception of TEST and
> XID frames which use LLC
> Type 1. The basic SAPs used by SNA are:
>
> SAP 0x00 is the null SAP and is used with a TEST
> frame
> or a XID (Exchange ID) frame
> 0x01 is reponse with C/R bit set (SSAP)
> 0x04 is the basic SAP for SNA traffic, SNA
> has SAPs
> 0x04 and all multiples of this SAP
> reserved so this
> covers 0x04, 0x08, 0x0C, etc.
> 0x05 is 0x04 with the group bit turned on
> (DSAP) and is referred
> to as SNA Group, likewise for 0x09,
> and 0x0D.
>
> The last bit in a DSAP is the I/G (Individual/Group)
> bit; the last bit in a
> SSAP is the C/R (Control/Response) bit. These can
> be 0 or 1 depending
> on function.
>
> The SAPs that can be used are thus 00, 01, 04, 05,
> 08, 09, 0C, 0D hence
> the access-list for permitting/denying SNA is
> access-li 200 permit/deny 0x00 00 0x 0D 0D.
>
> HTH, Fred
>
> ----- Original Message -----
> From: "Tom Young" <gitsyoung@yahoo.co.jp>
> To: <ccielab@groupstudy.com>
> Sent: Friday, July 12, 2002 11:17 PM
> Subject: SNA's sap list
>
>
> > Hi, group
> >
> > I know the SNA's sap list is
> 0x00,01,04,05,08,09,0C,0D.
> > But I couldn't find the function about them. Who
> can tell
> > me what the means of them?
> >
> > Thanks
> >
> >
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